#include <iostream>
using namespace std;
#include <vector>
#include <algorithm>

// 二元谓词
class MyCompare
{
public:
    bool operator()(int v1, int v2)
    {
        return v1 > v2;
    }
};

void test1()
{
    vector<int>v;
    v.push_back(10);
    v.push_back(30);
    v.push_back(20);
    v.push_back(50);
    v.push_back(40);

    sort(v.begin(), v.end());
    for (vector<int>::iterator it = v.begin();it != v.end();it++)
    {
        cout << *it << " ";
    }
    cout << endl;

    // 使用函数对象 改变算法策略，变为排序规则为：从大到小
    sort(v.begin(), v.end(), MyCompare());
    for (vector<int>::iterator it = v.begin();it != v.end();it++)
    {
        cout << *it << " ";
    }
    cout << endl;
}

int main()
{
    test1();
    
    return 0;
}